The staircase model is very informative. I really thought your explanation of it was very well done. Though it seems a suicide bomber has no turning back, and are willing to die for their cause we must remember there will be exceptions to the rules. There will be occasions when radicalize individuals for some internal decision might change their mind. Whether they realize their group is not what he or she originally expected. Also other exterior motives might have caused them become disillusioned with the cause.
